Speed-indicating mechanism



Jan. 21, 1930. v E. F. MARTINET 1,744,402

SPEED INDICATING MECHANISM Filed Jan. 14, 1929 1 a .7 g D 9 Cg INVENTOR.fayezzefi Mart /1r? aromas.

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Patented Jan. 21, 193i) UNITED STATES L'ZMAFE PATENT OFFICE EUGENE IE.MARTINET, OF CLEVELAND, ()I-IIO, ASSIGNOR TO THE DUAL SPEEDOMETERCOMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO SPEED-INDIGATINGMECHANISM Application filed January 14, 1929. Serial No. 332,256.

Speed indicating devices have already been proposed in which there is arunning index capable of being stopped atwill to retain an indication ofthe running speed at any de- I This is of considerable advantage totraffic officers and to users generally where accuracy is wanted. In thepresent invention however, I have now made available not only all theutilities of a stop indication of any desired speed, but in addition therunning speed indication is continually available without interferenceor inter ruption by the retained indication.

To the accomplishment of the foregoing and related ends, the invention,then, consists of the features hereinafter fully described, andparticularly pointed out in the claims, the following description andthe annexed drawing setting forth in detail certain structure embodyingthe invention, such being illustrative however of but one of the variousways in which the principle of the invention may be employed.

In said annexed drawing Fig. 1 is a plan view showing an embodiment ofthe invention; Fi 2 is a similar view with the cover assembly removed;Fig. 3 is a fragmentary axial section; Fig. i is a fragmentary sideelevation; Fig. 5 is an inside view of the cover plate assembly; Fig. 6is a sectional detail taken on a plane indicated by the line VI -VI,Fig. 5; and Fig. 7 is an enlarged sectional detail.

In its general aspects, the invention 0011- templates a running indexfor showing the speed variations at all times and an index optionallycontrollable to retain an indication of the running speed at any desiredinstant. Preferably a maximum indicating index is also associated withthe running index.

The particular mechanism by which the speed is translated to the runningindex is immaterial to the present invention and will .be understood tobe of any convenient character, whether centrifugal, ma netic, etc., andin the form of the invention illustrated is housed in a casing 1, a partonly of which is shown, and the shaft directly actuating the indexingmember, here an index hand 2,

projects at 3 through a dial plate i. A maximum indicating hand 5 wheredesired may be mounted so as to be propelled forward by the running handand by suitable mechanism, the detail of which is immaterial, be adaptedto remain at the furthest advanced position, subject to resetting, inany customary or well known manner.

Over the shaft 3 with its running index or hand is a cover 6, includinga glass 7; and carried by such cover in a position to be associated withthe running index or with its shaft, is an auxiliary index or hand 8.Advantageously this may be mounted for in stance by a grooved collar 9fast to or integral with the index hand 8; and cooperating in the groovea holding fork 11 is arranged such as to allow of movement ashereinafter more particularly set forth. The fork 11 is carried by anarm 12 which is secured at the end 13 to the cover in suitable manner,as by screw or rivet attachment to a metal plate 14 forming part of thecover assembly. Cooperating with the arm 12 is an optionally actuatedmeans for raising or lowering the fork 11 and therewith the groovedcollar 9 and the hand 8, whereby such hand may be seated down intoengagement with the running hand 2 so as to be carried thereby or to beraised and held in suspended position free from such running hand. Aleaf or guard 12 cooperates wit-h the collar 9 and fork 11. Preferably,the arm 12 is of slightly resilient material tending normally to seatthe collar 9 and the hand 8 in superposed position over the running hand2. A lifting means, as a cam 15 on a stud 16 mounted through the cover,serves to raise the arm 12 and the collar 9 with its hand 8, whendesired. A thumb lever 17 fastened to the outer end of the stud 16provides for such actuation as desired. Where preferred, a spring 18 maybe arranged in connection with the stud 16 so as to insure of its being.retained in either position to which the cam thereon may be swung.

In use, the shaft 8 being in motion proportional to the speed from theinitial source will tend to move its connected indicating index 2 so asto show from moment to moment the running speed. The maximum hand 5 isalso pushed along by the running hand 2 and is retained at its furthestadvanced position, until released, as by a pressure upon therelease-button 19. The auxiliary hand 8 is normally set down intorunning position superposed on the hand 2 so as to move therewith. Whenit is desired to preserve an indication of the running speed at anygiven moment, the thumb lever 17 is thrown over, thus rocking the stud16. and the cam 15, the latter then crowding the arm 12 so as to raiseit and the fork 11 with the engaged collar 9 and auxiliary hand 8. Thelatter is thus separated from its drive and is retained in such positionstationarily. hen such stationary registration by the auxiliary index 8is no longer desired, the thumb lever 17 is thrown back to reverseposition, thus releasing the cam 15 from the arm 12 and the auxiliaryhand 8 is then seated down on the running hand 2, to travel therewith inits varied movement. In order to insure uniformity of engagement withthe hand 2, an interconnection with such hand or with the shaft 3 isprovided, and preferably this may take the form of a pin 20 on the hand8 engageable in a corresponding recess 21 on the running hand 2.

It will thus be seen that the device as a whole presents a running indexshowing the speed at all times and a maximum index, and further anoptionally controllable index capable of preserving an indication of therunning speed at any given moment. And the assembly moreover is of acompact characacter such as to simplify manufacture, as well as toinsure accuracy and durability in usage.

Other modes of applying the principle of the invention may be employed,change being made as regards the details disclosed, provided the meansstated in any of the following claims, or the equivalent of such, beemployed.

I therefore particularly point out and distinctly claim as myinvention 1. In a speed indicating device, the combination of a runningspeed index. and an optionally controllable means for retaining anindication of the running speed at any desired instant without stoppageof the running index and irrespective of whether the speed is decreasingor increasing.

2. In a speed indicating device, the combination of a running speedindex, a maximum index, and an optionally controllable means forretaining an indication of the running speed at any desired instantwithout stoppage of the running index.

3. In a speed indicating device, the combination of a running speedindex, and another index optionally controllable for retaining anindication of the running speed at any desired instant and irrespectiveof whether the speed is decreasing or increasing.

4. In a speed indicating device, the combination of a running speedindex, a maximum index, and another index optionally controllable forretaining an indication of the running speed at any desired instant andirrespective of whether the speed is decreasing or increasing.

5. In a speed indicating device, the combination of a speed indicatingshaft, a running index actuated thereby, and another index movable inrelation and optional y retainable in a stationary posit-ionirrespective of whether the speed is decreasing or increas ing.

6. In a speed indicating device, the combination of a speed indicatingshaft, a running index actuated thereby, a maximum index, and anotherindex movable in relation with the running index and optionallyretainable in a stationary position.

7. In a speed indicating device, the combination of a speed indicatingshaft, a running hand attached thereto, and another hand connectible totravel back and forth with said running hand and optionallydisconnectible at any point.

8. In a speed indicating device, the combination of a speed indicatingshaft, a running h and attached thereto, a maximum hand, and anotherhand connectible to travel back and forth with the running hand andoptionally disconnectible at any point.

9. In a speed indicating device, the combination of a cover, a handcarried thereby adapted to be superposed on a running hand to travelback and forth therewith, and means for disengaging said hand from therunning hand.

10. In a speed indicating device. the combination of a cover, a handcarried thereby adapted to be superposed on a running hand to travelback and forth therewith, and means mounted in the cover for liftingsaid hand from the running hand.

11. In a speed indicating device. the combination of a cover, a handcarried thereby adapted to be superposed on a running hand to travelback and forth therewith. and a manually controlled stud mounted throughthe side of the cover for lifting said hand from the running hand.

12. In a speed indicating device. the combination of a cover. a handadapted to be superposed on running hand, a grooved hub collar on saidhand, a fork in the groove of said hub collar, an arm carrying said forkand mounted on the cover, and a cam for lifting said arm.

13. In a speed indicating device, the combination of a cover, a handadapted to be superposed on a running hand, a grooved hub collar on saidhand, a fork in the groove of said hub collar, a cam for lifting saidarm, a stud carrying said cam and projecting through the side of thecover, and a thumb lever on the projecting end of said stud.

14. I11 a speed indicating device, the 00111- bination of a cover, ahand adapted to be superposed on a running hand, a grooved hub collar onsaid hand, a fork in the groove of said hub collar, a resilient armcarrying said fork and mounted on the cover, a cam for lifting said arm,a stud carrying said cam and projecting out through the side of thecover, and a thumb lever on the projecting end of said stud.

Signed by me this 10th day of January,

EUGENE F. MARTINET.

